package day6;

import java.util.Arrays;

/**
 * @author oldliu
 * @since 1.0
 */
public class SysTest {
    public static void main(String[] args) {
        System.out.println(System.getenv());
        System.out.println(System.currentTimeMillis());
        System.out.println(System.nanoTime());//纳秒
        int a=23*143;
        System.out.println(a);
        System.out.println(System.nanoTime());
        System.out.println(">>>>>>>>>>>>>>>>>>>>>复制数组>>>>>>>>>>>>>>>>>>>");
        int []a1={1,2,4,6,10};
        int []a2=new int[30];
        System.arraycopy(a1,0,a2,1,a1.length);
        System.out.println(Arrays.toString(a2));
    }
}
